GB1207319A - Temperature compensated magnetic focusing structure - Google Patents

Temperature compensated magnetic focusing structure

Info

Publication number
GB1207319A
GB1207319A GB5574967A GB5574967A GB1207319A GB 1207319 A GB1207319 A GB 1207319A GB 5574967 A GB5574967 A GB 5574967A GB 5574967 A GB5574967 A GB 5574967A GB 1207319 A GB1207319 A GB 1207319A
Authority
GB
United Kingdom
Prior art keywords
temperature
magnets
focussing
dec
rings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5574967A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1207319A publication Critical patent/GB1207319A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
    • H01J23/087—Magnetic focusing arrangements
    • H01J23/0873—Magnetic focusing arrangements with at least one axial-field reversal along the interaction space, e.g. P.P.M. focusing

Abstract

1,207,319. Electron beam focussing apparatus. INTERNATIONAL STANDARD ELECTRIC CORP. 7 Dec., 1967 [13 Dec., 1966], No. 55749/67. Heading H1D. A temperature-compensated permanent magnet periodic focussing structure includes a plurality of annular magnets 22 of which the strength decreases with temperature, adjacent magnets having like poles facing one another and being spaced apart by polepieces each of which is formed of an inner part 24 of low reluctance material having an external diameter less than that of the magnets, and an outer ring 28 of a material whose permeability decreases with increase of temperature within the range for which temperature compensation is desired. In the travelling-wave tube focussing structure shown, the magnets 22 are of barium ferrite ceramic, parts 24 of soft iron, and rings 28 of an iron/nickel alloy containing 30% nickel, which becomes non-magnetic at an elevated temperature. The arrangement may additionally include a prior art temperaturecompensating magnetic shunt 26, of a material having a somewhat lower permeability than the rings 28.
GB5574967A 1966-12-13 1967-12-07 Temperature compensated magnetic focusing structure Expired GB1207319A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US60148266A 1966-12-13 1966-12-13

Publications (1)

Publication Number Publication Date
GB1207319A true GB1207319A (en) 1970-09-30

Family

ID=24407654

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5574967A Expired GB1207319A (en) 1966-12-13 1967-12-07 Temperature compensated magnetic focusing structure

Country Status (1)

Country Link
GB (1) GB1207319A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2277635A (en) * 1993-04-28 1994-11-02 Eev Ltd Magnet arrangements

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2277635A (en) * 1993-04-28 1994-11-02 Eev Ltd Magnet arrangements

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee